Gauge



April 8 ,y 1924.

B. M. W. HANSON GAUGE Filed Apm' 19; 1921v A; Gwenn into t- Patented Apr. 8,1924.

*UNITED V STATES Banca' n. w. Hanson, or mm'rroan, otzonmic'rrcu'r.v

GAUGE.

Application -led April 19, 1921. Serial No. 462,748. l

T0 all whom it may concern.'

Be it known that I, BENGT M. W. HANsoN,

a citizen of the United States, and a resident `which the following is a speciication.

This invention relates to a gauge of the type illustrated and described in my co-pend- 10 ing applications Serial Numbers 461,956 and 461,957, filed April 16, 1921. The present invention is directed more particularl to the means for adjusting the j aw faces re ative to one an'othe I In the accom anyng drawing Fig. 1 is a si e e evation of a gauge with parts broken away, looking in the direction of the arrow 1 of Fig. 3.

Fig. 2 -is a side elevation thereof with parts broken away and looking in the" direction of the arrow 2 of Fig. 3.

Fig. 3 is a sectional v1ew taken on line 3--3 of Fig. 2 and looking in the direction of the arrow 3, and

Fig. 4 is an enlarged detail view of what -is shown in section 1n Fig. 2.

Referring to the drawlngin detail, a is a C-frame or Yclamp having a pair of heads 10, 11 on which are mounted jaws b and c, the opposed faces of which are provided, respectively, with serrations 12, 13, each similar in transverse section with the grooveof the thread to be gauged, except that the serrations may not be as deep as the groove. The ser-rations of one jaw face are laterally inclined to those of the other face in accordance with the angle between diametrically pposite portions of the thread to be ga e e jaw member b is maunted for transverse movement on the head 10, it being gulded in this movement by a tongue 15 slidably mounted in a roove 16. This 'jaw member is resiliently eld to its seat by a sprin 17 coiled about a screw 18 threaded e member b and extending through a slot 19 in the head. The jaw face of the member c is transversely rooved as at 20 and the forward edge 21 o `this groove may bev employed to indicate the point past which a member must -go'to be below the maximum limit of accuracy. The rear'edges 22 of the serrations may be employed to 1ndicate the point past which t e threaded member should not go-to be above the minimum limit of accuracy. E,

-test piece Interposed between the head 11 andthe jaw member o 1s a wedge 25 adapted to bc adjusted in the general direction of the len h ofthe serrations, that is, longitudinal y of the jaw faces, by a screw 26. In practice, a plurality of interchangeable wedges, varying in ta ers correspondlng to different specified limlts of tolerances, are

provided. The surface 27 of the'head 11 on which the wedge rides, is inclined in the general direction of the length of the jaws to the face of the jaw b, and a .wedge is selected for interpositioning between this -surface and the jaw member c of such taper.x that the extent of inclination of the ljaw 'face on the member c between the g point 21 and the not go point 22 relatlve to the jaw facev member b is equal to the working al. l

of the lowance. For the purposes of illustration, the surface 27 is shown inthedrawings asy being inclined at an angle of 5 to the face of the member b and thetaper of the wedge is 4, and therefore thejaw face of the member o is inclined at a angle of 1 to the jaw face of the member as shown in Fig. 4. It may be assumed that a 4 wedge, as shown in the drawings, is employed whenthe speciied working allowancev is .001. In the event the working allowance is .002, a 3 wedge will be interposed between the member c and the surface 27 so that the jaw faces will be relatively inclined at an angle of 2.

The jaw memberl o is secured in place by bolts 28 which extend through elongated slots 29 in the wedge so as to permit of adjustment of the latter. For the purpose of reventi-ng transverse movement of the memer o, it is keyed to the wedge as at 30.

In setting up' the gauge, be selected of such taper that when interposed between the head 11.and the member c, the dilference between the distances between the respective edges 21, 22 and the jaw b will be equal to the`s eciied limits of tolerance. The wedge 25 1s then longitudinally adjusted, after loosening the bolts 28, until the jaw faces are so spaced'apart that athreaded having a diameter exactly equal to the specified maximum limit of tolerance, say 1., will 'just pass the go point 21, and

a.- second test piece having a diameter of.

a wedge 25 will be gauged is now inserted'v between the jaw faces and as it is moved longitudinally of the serrations, the lead of the thread will cause the jaw member b to move transversely. If the threaded member passes the go point 21 but fits closely between the jaw faces efore it reaches the not go point 22, it is necessarily within the predetermined limits of accuracy. It will be seen that in the event the jaw faces should become worn down, this Wear may very easily be taken up by adjusting the Wedge by means of the screw 26.

I claim as my invention 1. Ina gauge, a frame, a pair of jaw members carried thereby and having their opposed faces provided with serrations, a plurality of wedges varying in taper from one another and adapted to be interchangeably positionedbetween said frame and one of said members, and means for adjusting a wedge positioned between said frame and jaw member. l

2. In a gauge, a frame, a pair of opposed jaws carried thereby and each having a plurality of sei-rations, a wedge interposed between said frame and one of said jaws, and tapering in the general direction of the length of said serrations, and means for adjusting said wedge in the direction of its taper.

3. In a gauge, a frame provided with a jaw having a plurality of serrations and a surface opposed and inclined to said jaw, a complementar jaw provided with serrations, said sur ace and complementary jaw being arranged to receive between them any one of a plurality of wedges varying in taper from one another, one of said Wedges between said surface and complementary jaw, and a screw for adjusting the' wedge interposed between said surface and complementary jaw.

BENG'I M. W. HANSON. 

